The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 01, 1993
Filed:
Sep. 01, 1992
Koji Sakakibara, Hekinan, JP;
Hirohiko Yamada, Anjo, JP;
Nippondenso Co., Ltd., Kariya, JP;
Abstract
The knock control apparatus for an internal combustion engine comprises a knock detecting unit, a knock intensity value detecting unit for detecting a knock intensity value from a knock detecting output signal of the knock detecting unit within a predetermined crank angle range, a unit for calculating a mean value of the knock intensity value, a unit for calculating a mean deviation between the knock intensity value and the mean value, a cumulative percentage point updating unit for updating a cumulative percentage point of the distribution of the knock intensity value, a first updated quantity calculating unit for calculating a first updated quantity based on the knock intensity value and the cumulative percentage point, a second updated quantity setting unit for setting a second updated quantity for updating the cumulative percentage point updating unit based on the magnitude relationship between the first updated quantity and the mean deviation, a knock decision level calculating unit for calculating a knock decision level based on an updation result of the cumulative percentage point updating unit, and a knock decision and control unit for deciding presence or absence of knocking based on a comparison between the knock intensity value and the knock decision level and controlling knock control factors based on a result of the decision, whereby both conditions of the response at the time of a transient operation and the stability during a normal operation, respectively, of the engine are satisfied so that an optimum knock decision level may always be obtained.